Dark-eyed junco from Report of an expedition down the Zuni and Colorado Rivers (1853) published by Lorenzo Sitgreaves.… Free Image from public domain license 
Vintage Victorian style penguins engraving. Original from the British Library. Digitally enhanced by rawpixel. Free Image from public domain license 
Vintage European style camel engraving from Woodland Romances; or, Fables and Fancies by Clara L. MateìAux (1877).… Free Image from public domain license 
Vintage European style bear from Woodland romances, or, fables and fancies by Clara L. MateìAux (1877). Original from… Free Image from public domain license 
Vintage European style livestock cow engraving from The Austro-Hungarian Monarchy in Word and Picture by Anonymous (1885).… Free Image from public domain license 
Vintage Victorian style peacock engraving. Original from the British Library. Digitally enhanced by rawpixel. Free Image from public domain license 
Vintage European style bear engraving from The Polar Regions Of The Western Continent Explored; Embracing A Geographical… Free Image from public domain license 
Vintage Victorian style peacock engraving. Original from the British Library. Digitally enhanced by rawpixel. Free Image from public domain license 
Vintage European style livestock sheep engraving from Columbus, Ohio by Jacob H. Studer (1873). Original from the British… Free Image from public domain license 
Illustration of Toco and Rhinoceros bird from Zoological lectures delivered at the Royal institution in the years 1806-7… Free Image from public domain license 
Front viewed of eight armed cuttle fish from Zoological lectures delivered at the Royal institution in the years 1806-7… Free Image from public domain license 
Vintage illustration of eight armed cuttle fish from Zoological lectures delivered at the Royal institution in the years 1806… Free Image from public domain license 
Oceanic flying fish from Zoological lectures delivered at the Royal institution in the years 1806-7 illustrated by George… Free Image from public domain license 
Lancet acanthurus from Zoological lectures delivered at the Royal institution in the years 1806-7 illustrated by George Shaw… Free Image from public domain license 
Variegated baboon from Zoological lectures delivered at the Royal institution in the years 1806-7 illustrated by George Shaw… Free Image from public domain license 
Illustration of Constrictor boa from Zoological lectures delivered at the Royal institution in the years 1806-7 illustrated… Free Image from public domain license 
Illustration of Leopard and Panther from Zoological lectures delivered at the Royal institution in the years 1806-7… Free Image from public domain license 
Illustration of Great Mysticete from Zoological lectures delivered at the Royal institution in the years 1806-7 illustrated… Free Image from public domain license 
Illustration of Dodo from Zoological lectures delivered at the Royal institution in the years 1806-7 by George Shaw (1751… Free Image from public domain license 
Illustration of Elephant from Zoological lectures delivered at the Royal institution in the years 1806-7 illustrated by… Free Image from public domain license 
Monkey in cockatoo (1900 - 1930) by Ohara Koson (1877-1945). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Group of Egrets (1925 - 1936) by Ohara Koson (1877-1945). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Egret in the rain (1925 - 1936) by Ohara Koson (1877-1945). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Ostrich, Struthio camelus (1596–1610) by Anselmus Boëtius de Boodt. Original from the Rijksmuseum. Digitally… Free Image from public domain license 
Hippocampus and fish, Fantasy animals (1596–1610) by Anselmus Boëtius de Boodt. Original from the Rijksmuseum.… Free Image from public domain license 
Great Barrier Reef Fishes from The Great Barrier Reef of Australia (1893) by William Saville-Kent (1845-1908). Digitally… Free Image from public domain license 
Toco toucan from Histoire Naturelle des Oiseaux de Paradis et Des Rolliers (1806) by Jacques Barraband (1767-1809). Original… Free Image from public domain license 
White-headed Osprey (Pandion leucocephalus) illustrated from A Synopsis of the Birds of Australia and the Adjacent Islands… Free Image from public domain license 
Bull Frog (Rana maxima) from The natural history of Carolina, Florida, and the Bahama Islands (1754) by Mark Catesby (1683… Free Image from public domain license 
A traditional portrait of a flock of beautiful Japanese red crown crane by Ogata Korin (1658-1716). Digitally enhanced from… Free Image from public domain license 
Sperm whale (Physeter macrocephalus) from Natural history of the cetaceans and other marine mammals of the western coast of… Free Image from public domain license 
Golden Pheasant in the Snow (ca. 1900) illustration by Ito Jakuchu. Original from The MET Museum. Digitally enhanced by… Free Image from public domain license 
Peacock (1925 - 1936) by Ohara Koson (1877-1945). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Cock illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own 1892 edition of Dictionnaire… Free Image from public domain license 
Crimson Crawfish (Palemon Ornatum) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own… Free Image from public domain license 
Toucan (Ramphastos) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own 1892 edition of… Free Image from public domain license 
Jaguar (Panthera Onca) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own 1892 edition… Free Image from public domain license 
Different types of birds illustrated by Charles Dessalines D' Orbigny (1806-1876) Digitally enhanced from our own 1892… Free Image from public domain license 
Different types of birds illustrated by Charles Dessalines D' Orbigny (1806-1876) Digitally enhanced from our own 1892… Free Image from public domain license 
Asiatic elephant (Elephas maximus) indicus illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from… Free Image from public domain license 
Giraffe (Giraffa camelopardalis) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own… Free Image from public domain license 
Indian peafowl (Pavo Cristatus) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own… Free Image from public domain license